Gypsum wallboard and method for producing same
disclosed is a paper-covered gypsum board comprised of a gypsum core and a paper cover sheet covering at least one side of said core, the surface of said paper cover sheet adjacent the gypsum core being surface sized with a sizing composition initially comprised of a hydrophobic cellulose reactive sizing agent and a nitrogen-containing condensation product.
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Description
Patent History
Patent number: T977009
Type: Grant
Filed: Mar 24, 1978
Date of Patent: Dec 5, 1978
Assignee: Hercules Incorporated (Wilmington, DE)
Inventors: David H. Dumas (Wilmington, DE), David R. Warren (New Castle County, DE)
Application Number: 5/889,693
Type: Grant
Filed: Mar 24, 1978
Date of Patent: Dec 5, 1978
Assignee: Hercules Incorporated (Wilmington, DE)
Inventors: David H. Dumas (Wilmington, DE), David R. Warren (New Castle County, DE)
Application Number: 5/889,693
Classifications
Current U.S. Class:
428/476;
Non-fiber Additive (162/158);
428/537
International Classification: B32B 2710;
International Classification: B32B 2710;
